The Iowa Lottery is encouraging ticket holders to double-check their numbers as a $1 million prize remains unclaimed.

It has been nearly a month since the numbers were announced and no one has claimed to have the winning ticket, which was purchased at a Casey's General Store located at 1800 S. B Ave., in Nevada.

Iowa Lottery officials and employees of the Casey's held a news conference Friday regarding the unclaimed ticket.

Mary Neubauer, a spokesperson for the Iowa Lottery, said that though the winner has plenty of time to claim their prize, it is unusual for a prize of this size to remain unclaimed for nearly a month.

The manager of the Casey's, Kim Cochron, said that people have been coming in asking if there was a winner yet ever since the numbers were announced on April 11.

"We're just hoping that some comes forward," Cochron said, "because it's a really exciting thing to have a million dollar winner, so we'd really like to have them claim the prize."

A sign has been placed in the store to let customers know that the prize remains unclaimed and to encourage ticket holders to check their numbers. The store will still receive their bonus of $1,000 whether the ticket is claimed or not.

The winner has until April 11, 2019 to claim their prize.

A prize of this size must be claimed at Iowa Lottery headquarters at 13001 University Ave. in Clive. People can check their Powerball tickets here.